Temple Sinai, also known as Congregation Sinai, whose official name is the Sumter Society of Israelites, is an historic Reform Jewish congregation and synagogue, located at 11-13 Church Street, on the corner of West Hampton Avenue, in Sumter, South Carolina, in the United States.

[2][3] Built in 1912 of brick in the Moorish Revival style, Temple Sinai was added to the National Register of Historic Places on January 21, 1999.

The sanctuary of the present temple was built in 1912 facing Church Street to replace an earlier wooden synagogue on the site.

[4] The Barnett Memorial Addition, a two-story brick Moorish Revival auditorium/banquest hall and classroom/office building facing West Hampton Avenue, was built in 1932, behind the sanctuary, which it complements.

In 1956, the one story brick Hyman Brody Building was attached to the rear of the Barnett Memorial Addition to provide a kitchen and more classrooms, offices and restrooms.